The best EVFs are now good enough for most activities. My first was in a Canon Pro 1. It was easy to use; but had a 1/4-1/3 second lag. The latest cameras have cut that lag down to under 20 milliseconds. The mirror time on a DSLR is longer than that. Your G6 has a good EVF; but even that is at least one generation behind.

However there is a difference between the lag on an EVF and shutter lag on a DSLR (what you refered to as mirror time?) and it is this:

With an SLR or DSLR you view the image in real time and then there is a small delay in between pressing the shutter button and the shutter firing. The key point is that viewing through an OVF means that the subject is exactly where you are pointing the camera (optical lag, if we can call it that, is zero. Well allowing for the speed of light anyway.) The user can fairly easily compensate for shutter lag by practise. Having said that professionals who really specialise in fast moving sports are reluctant to shoot with two bodies that do not have very similar shutter lag values because the difference throws their timing out.

Now lag in an EVF throws up a completely different issue - which is that because of the lag, especially if you are following a rapidly moving subject, the subject is not exactly where the EVF tells you it is. Even with a lag of only 20 milliseconds. And on top of that you still also have the effect of shutter lag. Of course this is not really an issue for, say, landscape photographers.

The only way a user can compensate for EVF lag is either by trying to also follow the subject with the other eye that is not looking through the viewfinder (hard to do, especially with tele lenses and almost guaranteed to give you a a bad headache!). Or by luck.

The total lag time may be comparable but I think you've missed the point I was making.

That being said, the EVF lag issue is being exagerrated. I have never seen that to be an issue. Greater issue is person's response and predictability of the subject which in most cases is non issue. In fact, many seem to not want to give up stabilization either which introduces its own lag.

How does stabilisation introduce a lag?

Sooner or later, pro bodies with EVF will be developed along with lenses to go with. At this point, we are finally transitioning into digital photography.

1- Lag, that influences an image capture is an issue regardless of where it comes from: be it ones inability to track as action occurs to capture a particular moment or lag that delays capturing that moment.

2- How does stabilization work? What happens when you use stabilization?

Why don't you tell us?

But you had indigestion with that. So, let us see how stabilization does its magic and without introducing any kind of lag.